Relationships are handled in the :user_columns declarations just like other column types. So, in the example below, Team has_one :coach. In this case, the :show_view is called :name and combines the :first_name and :last_name fields of the :coach instance using an empty space and uses that value as the column contents. The :edit_view is called :select, which is the default, and creates a dropdown. You could use the same modifiers (:fields and :separator) to populate the dropdown with customized values.

Streamlined.ui_for(Team) do

   user_columns   :id, {:read_only => true},
                  :name, {:link_to => {:action => "edit"}},
                  :sport, {:popup => true},
                  :coach, {
                        :show_view => [:name, 
                                      { :fields => [:first_name, :last_name], :separator => " " },
                        ],
                        :edit_view => [:select]}

end

There are many available :show_ and :edit_views, plus the model is extensible. Here are the currently available versions.

Show Views

Name	Use	Available
Link	Link to related table	All
Count	Shows number of related items	1-to-n
List	Display data from related models	1-to-n
Sum	Calculate sum of field on related items	1-to-n
Average	Calculate average of field on related items	1-to-n
Name	Display data from related item	n-to-1
Enumerable	Treat association as an enumerable	n-to-1
Graph	Display sparklines graph of related items	1-to-n

The default for show-views for a 1-to-n relationship is count, and for a 1-to-1 is name.

Edit Views

Name	Use	Available
Inset Table	Master-detail view	Any
Membership	Allows user to select items	1-to-n
Polymorphic Membership	Allows user to select related items of polymorphic relationship	1-to-n
Window	Shows related items in table in popup window	1-to-n
Select	Select related item from dropdown	n-to-1
Polymorphic Select	Select related polymorphic item from dropdown	n-to-1
Enumerable Select	Treat association as an enumerable	n-to-1
Filter Select	Like membership, but uses Ajax to allow filtering of possible matches	1-to-n